#include <iostream>
#include <stdio.h>
#include <vector>
#define ffor(i,max) for(int i = 0 ; i< max ; i++)
#define DEBUG

using namespace std;

#ifdef DEBUG
int main()
{
#	freopen("data.in","r",stdin);
#   freopen("data.out","w",stdout);

	return 0;
}
#endif
